An underground gas storage injection-production string composite variable-damping semi-active damper system

Abstract

The application provides a kind of underground gas storage injection-production string composite variable-damping semi-active damper system, the semi-active damper system includes casing string, magneto-rheological fluid and particle damping composite semi-active damper, injection-production string and natural gas, the magneto-rheological fluid and particle damping composite semi-active damper is connected in series on the injection-production string by thread, the annular space formed by injection-production string and casing string is filled with annular filling fluid, when the injection-production operation of natural gas is carried out, the vibration of injection-production string, the magneto-rheological fluid and particle damping composite semi-active damper connected in series on the injection-production string will transfer the vibration energy of injection-production string and convert it into heat energy dissipation to achieve the purpose of vibration reduction.The application can effectively reduce the vibration response of injection-production string, prolong the service life of injection-production string, improve the safety of operation, and has high economic value;when the power is exhausted, it can also be used as a passive damper to achieve good damping effect.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of underground gas storage engineering, and particularly relates to a compound variable-damping semi-active damper system for injection-production pipe string of underground gas storage. BACKGROUND

[0002] The underground gas storage is a kind of gas field or gas reservoir formed by re-injection of natural gas transported by long-distance pipeline into underground closed space. The underground gas storage circulates an injection-production cycle every year. In summer and autumn, the natural gas transported from the western region is temporarily injected into the local underground gas storage for storage, and in winter and spring, the natural gas in the underground gas storage is mined for use in the nearby area, so as to effectively regulate the supply and demand peak of natural gas. During the injection-production operation of the underground gas storage, the well bottom is at high temperature and high pressure, the well head is at normal temperature and normal pressure, the well bore is long and narrow, the annulus formed by the injection-production pipe string and the casing is filled with annulus filling fluid, the upper end of the injection-production pipe string is connected to the well head, the lower end is connected to the packer, and the high-speed unstable flow of natural gas in the injection-production pipe string and the fluid-structure coupling effect thereof cause the pipe string to vibrate violently (with large vibration energy and high vibration amplitude), which eventually leads to failure of the tubing thread, fatigue of the pipe string, damage of the downhole tool, and further directly affects the service life and operation safety of the injection-production pipe string. Therefore, it is of high economic value to design a semi-active damper with low energy consumption to reduce the vibration response of the injection-production pipe string, prolong the service life of the injection-production pipe string, and improve the operation safety. SUMMARY

[0003] The present application aims to overcome the shortcomings and difficulties in the prior art, and provides a compound variable-damping semi-active damper system for injection-production pipe string of underground gas storage, which comprises a casing string 1, a magneto-rheological fluid and particle damping compound semi-active damper 2, an injection-production pipe string 3, and natural gas 4. The magneto-rheological fluid and particle damping compound semi-active damper 2 is connected in series on the injection-production pipe string 3 through threads, the annular space formed by the injection-production pipe string 3 and the casing string 1 is filled with annulus filling fluid 5, and when the injection-production operation of the natural gas 4 is performed, the injection-production pipe string 3 vibrates, the magneto-rheological fluid and particle damping compound semi-active damper 2 connected in series on the injection-production pipe string 3 transfers the vibration energy of the injection-production pipe string 3 and converts it into heat energy to dissipate, so as to achieve the purpose of vibration reduction.

[0004] Preferably, the magnetorheological fluid and particle damping composite semi-active damper 2 comprises an upper end cover 201, a first sealing ring 202, a power supply 203, a first outer cylinder 204, a controller 205, a first vibration isolation support 206, an outer cylinder connecting short section 207, a coil 208, a second outer cylinder 209, an inner cylinder 210, a liquid injection piston 214, a lower end cover 216, a digital-to-analog converter 217, a second vibration isolation support 218, an acceleration sensor 219, and a magnetic core 220, wherein the outer ring of the upper end cover 201 is connected to the first outer cylinder 204 by threading, and the inner ring of the upper end cover 201 is limited by the stepped structure of the outer ring of the inner cylinder 210 and sealed by the first sealing ring 202 to isolate the annular space filled with liquid 5; the inner ring of the inner cylinder 210 is connected to the injection and extraction pipe column 3 by threading at both the upper and lower ends; the first vibration isolation support 206 and the second vibration isolation support 218 are connected to the inner cylinder 210 by screws; the controller 205 and the digital-to-analog converter 217 are connected to the first vibration isolation support 206 and the second vibration isolation support 218 by screws, respectively; the acceleration sensor 219 is fixed to the outer wall of the inner cylinder 210 by threading; the upper half of the outer cylinder connecting short section 207 is connected to the inner ring of the first outer cylinder 204 by threading, and the lower half of the outer cylinder connecting short section 207 is connected to the inner ring of the second outer cylinder 209 by threading; the outer cylinder connecting short section 207 is positioned and limited by the stepped structure of the second outer cylinder 209 to limit the displacement of the magnetic core 220; the coil 208 is installed and limited in the outer groove of the magnetic core 220 and connected to the power supply 203 through the through hole of the outer cylinder connecting short section 207; the outer ring of the lower end cover 216 is connected to the inner ring of the second outer cylinder 209 by threading.

[0005] Preferably, the second outer cylinder 209 and the inner side of the magnetic core 220 are provided with grooves and internally provided with third and fourth sealing rings 221 and 222, and the inner ring of the lower end cover 216 is limited by the stepped structure of the outer ring of the inner cylinder 210 and internally provided with a second sealing ring 215; the second, third, and fourth sealing rings 215, 221, and 222 form a closed space to place the magnetorheological fluid 211, the contraction air bag 212, and the damping particles 213; during the injection and extraction operation of natural gas 4, the injection and extraction pipe column 3 generates vibration, and the vibration energy is converted into kinetic energy of the damping particles 213, and the kinetic energy of the damping particles 213 is converted into heat energy by the fluid damping force of the magnetorheological fluid 3 to dissipate, achieving the purpose of vibration reduction; the liquid injection piston 214 is connected to the second outer cylinder 209 by threading for filling the magnetorheological fluid 211.

[0006] Preferably, the first and second vibration isolation supports 206 and 218 are internally provided with rubber pads with vibration isolation effect to reduce the influence of vibration on the controller 205 and the digital-to-analog converter 217.

[0007] Preferably, the power supply 203 is limited in the upper half of the first outer cylinder 204 through the stepped structure of the first outer cylinder 204, and provides energy for the controller 205, the coil 208, the digital-to-analog converter 217 and the acceleration sensor 219.

[0008] The application also aims to provide a use method of the underground gas storage injection-production string composite variable-damping semi-active damper system, comprising the following steps:

[0009] Step 1: Assembling the injection-production string 3 with the magneto-rheological fluid and particle damping composite semi-active damper 2 on land, injecting the magneto-rheological fluid 211 through the liquid injection piston 214, and lowering the injection-production string 3 with the magneto-rheological fluid and particle damping composite semi-active damper 2 to a designated position in the well;

[0010] Step 2: Starting the injection-production work of the natural gas 4, the acceleration sensor 219 transmits the measured vibration signal to the digital-to-analog converter 217, the digital-to-analog converter 217 converts the analog quantity of the vibration signal into a digital signal and transmits it to the controller 205, the controller 205 controls the current output intensity of the power supply 203 according to the vibration energy size through the built-in fuzzy control algorithm, the current passes through the coil 208 and generates a magnetic field of different intensity in the magnet core 220, and the magnetic field radiates to the sealed space below the storage magneto-rheological fluid 211, the contraction air bag 212 and the damping particles 213;

[0011] Step 3: Under the action of the external magnetic field, the viscosity of the magneto-rheological fluid 211 rapidly changes continuously, steplessly and reversibly, i.e. it will change back to liquid when the magnetic field is removed;

[0012] The coil 208 and the magnet core 220 generate a magnetic field of different intensity to change the viscosity of the magneto-rheological fluid 211, thereby changing the performance parameters of the particle damping vibration reduction, so as to adjust the damping parameters for different vibrations and achieve the best vibration reduction effect;

[0013] Step 4: When the magnetic field intensity increases, the viscosity of the magneto-rheological fluid 211 increases, the density increases, and the volume decreases, and the reduced volume will be supplemented by the expansion of the contraction air bag 212, so as to avoid the decrease of the pressure in the sealed space causing the deformation of the second outer cylinder 209 due to the internal and external pressure difference;

[0014] The vibration of the injection-production string 3 causes the movement of the damping particles 213, the mutual collision and friction between the damping particles 213, and the mutual movement and friction between the damping particles 213 and the magneto-rheological fluid 211 to convert the vibration into heat energy and dissipate, thereby achieving the vibration reduction purpose.

[0015] Preferably, when the power supply 203 runs out of energy, the magneto-rheological fluid and particle damping composite semi-active damper 2 becomes a passive damper.

[0016] Compared with the prior art, the application has the following beneficial effects:

[0017] The present application can effectively reduce the vibration response of the injection-production pipe column, prolong the service life of the injection-production pipe column, improve the operation safety, and has high economic value; and when the power is exhausted, it can also be used as a passive damper to achieve good damping effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The installation distribution diagram of the present application is shown in the figure;

[0019] Figure 2 The structure diagram of the magnetic rheological fluid and particle damping composite semi-active damper in the present application is shown in the figure;

[0020] Figure 3-1 The figure is Figure 2 The local enlarged view at F in the figure is shown in the figure;

[0021] Figure 3-2 The figure is Figure 2 The local enlarged view at G in the figure is shown in the figure;

[0022] Figure 3-3 The figure is Figure 2 The local enlarged view at H in the figure is shown in the figure;

[0023] Figure 4 The principle diagram of the intelligent control process of the present application is shown in the figure.

[0024] The figure is

[0025] 1-casing column, 2-magnetic rheological fluid and particle damping composite semi-active damper, 3-injection-production pipe column, 4-natural gas, 5-annular space filling liquid;

[0026] 201-upper end cover, 202-first sealing ring, 203-power supply, 204-first outer cylinder, 205-controller, 206-first vibration isolation support, 207-outer cylinder connecting short section, 208-coil, 209-second outer cylinder, 210-inner cylinder, 211-magnetic rheological fluid, 212-contracting air bag, 213-damping particles, 214-liquid injection piston, 215-second sealing ring, 216-lower end cover, 217-digital-analog converter, 218-second vibration isolation support, 219-acceleration sensor, 220-magnet core, 221-third sealing ring, 222-fourth sealing ring. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in combination with the drawings in the embodiment of the present application. In the drawings, the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all of the embodiments.

[0028] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative labor fall within the scope of the present application.

[0029] The embodiments described below with reference to the accompanying drawings and the terms used are exemplary and are intended to explain the present application, and are not to be understood to limit the present application.

[0030] In a broad embodiment of the present application, a composite variable-damping semi-active damper system for an injection-production string of an underground gas storage comprises a casing string 1, a magneto-rheological fluid and granular damping composite semi-active damper 2, an injection-production string 3, and natural gas 4, characterized in that the magneto-rheological fluid and granular damping composite semi-active damper 2 is connected in series on the injection-production string 3 by threads, and the annular space formed by the injection-production string 3 and the casing string 1 is filled with annular filling fluid 5. When the injection-production operation of the natural gas 4 is performed, the magneto-rheological fluid and granular damping composite semi-active damper 2 connected in series on the injection-production string 3 converts the vibration energy of the injection-production string 3 and dissipates it as heat to achieve the purpose of vibration reduction.

[0031] Preferably, the magneto-rheological fluid and granular damping composite semi-active damper 2 comprises an upper end cover 201, a first sealing ring 202, a power supply 203, a first outer cylinder 204, a controller 205, a first vibration isolation support 206, an outer cylinder connecting nipple 207, a coil 208, a second outer cylinder 209, an inner cylinder 210, a liquid injection piston 214, a lower end cover 216, a digital-to-analog converter 217, a second vibration isolation support 218, an acceleration sensor 219, and a magnetic core 220, wherein the outer ring of the upper end cover 201 is connected with the first outer cylinder 204 by threads, and the inner ring of the upper end cover 201 is limited by the outer ring of the inner cylinder 210 and sealed by the first sealing ring 202 to isolate the annular filling fluid 5; the inner ring of the inner cylinder 210 is connected with the injection-production string 3 by threads at both ends; the first vibration isolation support 206 and the second vibration isolation support 218 are connected with the inner cylinder 210 by screws; the controller 205 and the digital-to-analog converter 217 are connected with the first vibration isolation support 206 and the second vibration isolation support 218 by screws, respectively; the acceleration sensor 219 is fixedly connected with the outer wall of the inner cylinder 210 by threads; the upper half of the outer cylinder connecting nipple 207 is connected with the inner ring of the first outer cylinder 204 by threads, and the lower half of the outer cylinder connecting nipple 207 is connected with the inner ring of the second outer cylinder 209 by threads; the outer cylinder connecting nipple 207 and the second outer cylinder 209 are matched by a stepped structure to position and limit the displacement of the magnetic core 220; the coil 208 is installed in the outer groove of the magnetic core 220 and connected with the power supply 203 through the through hole of the outer cylinder connecting nipple 207; and the outer ring of the lower end cover 216 is connected with the inner ring of the second outer cylinder 209 by threads.

[0032] Preferably, the second outer cylinder 209 and the inner side of the magnet core 220 are provided with grooves and the third sealing ring 221 and the fourth sealing ring 222 are arranged in the grooves, the inner ring of the lower end cover 216 is limited by the stepped structure of the outer ring of the inner cylinder 210 and the second sealing ring 215 is arranged in the stepped structure, the second sealing ring 215, the third sealing ring 221 and the fourth sealing ring 222 form a sealed space for placing the magnetorheological fluid 211, the contraction air bag 212 and the damping particles 213, when the injection and production string 3 vibrates during the injection and production of natural gas 4, the vibration energy is converted into kinetic energy of the damping particles 213, and the kinetic energy of the damping particles 213 is converted into heat energy for dissipation through the fluid damping force of the magnetorheological fluid 3, so that the vibration reduction purpose is achieved; the liquid injection piston 214 is connected to the second outer cylinder 209 through threads, and is used for filling the magnetorheological fluid 211.

[0033] Preferably, the first vibration isolation support 206 and the second vibration isolation support 218 are provided with rubber pads with vibration isolation effect to reduce the influence of vibration on the controller 205 and the digital-analog converter 217.

[0034] Preferably, the power supply 203 is limited in the upper half of the first outer cylinder 204 through the stepped structure of the first outer cylinder 204, and provides energy for the controller 205, the coil 208, the digital-analog converter 217 and the acceleration sensor 219.

[0035] The application also provides a use method of the injection and production string composite variable-damping semi-active vibration absorber system of the underground gas storage.

[0036] Step 1: Assembling the injection and production string 3 with the magnetorheological fluid and particle damping composite semi-active vibration absorber 2 on land, injecting the magnetorheological fluid 211 through the liquid injection piston 214 and lowering the injection and production string 3 with the magnetorheological fluid and particle damping composite semi-active vibration absorber 2 to a designated position in the well.

[0037] Step 2: Starting the injection and production of natural gas 4, the acceleration sensor 219 transmits the measured vibration signal to the digital-analog converter 217, the digital-analog converter 217 converts the analog quantity of the vibration signal into a digital signal and transmits the digital signal to the controller 205, the controller 205 controls the current output intensity of the power supply 203 according to the vibration energy size through the built-in fuzzy control algorithm, the current passes through the coil 208 and generates a magnetic field with different intensities in the magnet core 220, and the magnetic field radiates to the sealed space below storing the magnetorheological fluid 211, the contraction air bag 212 and the damping particles 213;

[0038] Step 3: Under the action of the external magnetic field, the viscosity of the magnetorheological fluid 211 rapidly changes continuously, steplessly and reversibly, that is, the viscosity of the magnetorheological fluid 211 changes back to liquid when the magnetic field is removed.

[0039] The coil 208 and the magnet core 220 generate magnetic fields of different strengths to change the viscosity of the magnetorheological fluid 211, thereby changing the performance parameters of the particle damping vibration reduction, so as to adjust the damping parameters for different vibrations and achieve the best vibration reduction effect.

[0040] Step 4: When the magnetic field strength increases, the viscosity of the magnetorheological fluid 211 increases, the density increases, and the volume decreases. The reduced volume will be supplemented by the expansion of the air bag 212 to avoid the decrease of the pressure in the sealed space, which causes the deformation of the second outer cylinder 209 due to the pressure difference between the inside and outside.

[0041] The vibration of the injection and production string 3 causes the movement of the damping particles 213, the mutual collision and friction between the damping particles 213, and the mutual movement and friction between the damping particles 213 and the magnetorheological fluid 211 to convert the vibration into heat energy dissipation, thereby achieving the purpose of vibration reduction.

[0042] Preferably, when the power source 203 runs out of energy, the magnetorheological fluid and particle damping composite semi-active damper 2 becomes a passive damper.

[0043] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0044] Figure 1 As shown, a composite variable-damping semi-active damper system for an injection and production string of an underground gas storage includes a casing string 1, a magnetorheological fluid and particle damping composite semi-active damper 2, an injection and production string 3, natural gas 4, and an annular filling fluid 5.

[0045] The magnetorheological fluid and particle damping composite semi-active damper 2 is connected in series on the injection and production string 3 through threads, and the annular space formed by the injection and production string 3 and the casing string 1 is filled with the annular filling fluid 5. When natural gas injection and production operations are performed, the injection and production string 3 vibrates, and the magnetorheological fluid and particle damping composite semi-active damper 2 connected in series on the injection and production string 3 transfers the vibration energy of the injection and production string 3 to the damper and converts it into heat energy dissipation to achieve the purpose of reducing the vibration of the injection and production string 3.

[0046] Figure 2 As shown, the magnetorheological fluid and particle damping composite semi-active damper 2 includes an upper end cover 201, a first sealing ring 202, a power source 203, a first outer cylinder 204, a controller 205, a first vibration isolation support 206, an outer cylinder connecting nipple 207, a coil 208, a second outer cylinder 209, an inner cylinder 210, a magnetorheological fluid 211, a contraction air bag 212, damping particles 213, a liquid injection piston 214, a second sealing ring 215, a lower end cover 216, a digital-to-analog converter 217, a second vibration isolation support 218, an acceleration sensor 219, a magnet core 220, a third sealing ring 221, a fourth sealing ring 222, a casing string 1, an injection and production string 3, natural gas 4, and an annular filling fluid 5.

[0047] The outer ring of the upper end cover 201 is connected with the first outer cylinder 204 through thread, the inner ring of the upper end cover 201 is limited and sealed with the outer ring of the inner cylinder 210 through step cooperation and the first sealing ring 202, and the annular space is filled with liquid 5; the power supply 203 is limited in the upper half of the first outer cylinder 204 through the step structure of the first outer cylinder 204, and provides energy for the controller 205, the coil 208, the digital-analog converter 217 and the acceleration sensor 219; the inner ring of the inner cylinder 210 is connected with the two end injection and production pipe columns 3 through thread at the upper and lower ends; the first vibration isolation support 206 and the second vibration isolation support 218 are connected with the inner cylinder 210 through screws, the built-in rubber pad has a vibration isolation effect, reduces the influence of vibration on the controller 205 and the digital-analog converter 217, and the controller 205 and the digital-analog converter 217 are connected on the first vibration isolation support 206 and the second vibration isolation support 218 through screws; the acceleration sensor 219 is fixed on the outer wall of the inner cylinder 210 through thread; the upper half of the outer cylinder connecting nipple 207 is connected with the inner ring of the first outer cylinder 204 through thread, the lower half of the outer cylinder connecting nipple 207 is connected with the inner ring of the second outer cylinder 209 through thread, and the outer cylinder connecting nipple 207 is positioned with the magnet core 220 through the step structure cooperation of the outer cylinder connecting nipple 207 and the second outer cylinder 209 and limits the displacement of the magnet core 220; the coil 208 is installed in the outer groove of the magnet core 220 and is connected with the power supply 203 through the through hole of the outer cylinder connecting nipple 207; the second outer cylinder 209 and the inner side of the magnet core 220 are provided with grooves and are internally provided with the third sealing ring 221 and the fourth sealing ring 222, the outer ring of the lower end cover 216 is connected with the inner ring of the second outer cylinder 209 through thread, the inner ring of the lower end cover 216 is limited with the outer ring of the inner cylinder 210 through step cooperation and is internally provided with the second sealing ring 215, a closed space is formed through the second sealing ring 215, the third sealing ring 221 and the fourth sealing ring 222, the magnetorheological fluid 211, the contraction air bag 212 and the damping particles 213 are placed in the closed space, when the natural gas 4 is injected and produced, the vibration energy of the injection and production pipe column 3 is converted into kinetic energy of the damping particles 213, and the kinetic energy of the damping particles 213 is converted into heat energy through the fluid damping force of the magnetorheological fluid 3 to dissipate, so that the vibration reduction purpose is achieved; the liquid injection piston 214 is connected on the second outer cylinder 209 through thread, and is used for filling the magnetorheological fluid 211.

[0048] Figure 4As shown, the intelligent control flow principle diagram of the underground gas storage injection-production string composite variable damping semi-active damper system, the battery 203 provides energy for the controller 205, the coil 208, the digital-to-analog converter 217 and the acceleration sensor 219, the acceleration sensor 219 transmits the measured vibration signal to the digital-to-analog converter 217, the digital-to-analog converter 217 converts the analog quantity of the vibration signal into a digital signal and transmits it to the controller 205, the controller 205 controls the current output size of the power supply 203 according to the vibration energy size through the built-in fuzzy control algorithm, the current passes through the coil 208 and generates a magnetic field of different intensity in the magnet core 220, the coil 208 and the magnet core 220 generate a magnetic field of different intensity, which makes the viscosity of the magnetorheological fluid 211 change, and then changes the performance parameters of the particle damping vibration, so as to adjust the damping parameters for different vibrations and then achieve the best damping effect of the injection-production string 3.

[0049] A use method of an underground gas storage injection-production string composite variable damping semi-active damper system, comprising the following steps:

[0050] Step 1: Assemble the injection-production string 3 with the magnetorheological fluid and particle damping composite semi-active damper 2 on land, inject the magnetorheological fluid 211 through the liquid injection piston 214, and lower the injection-production string 3 with the magnetorheological fluid and particle damping composite semi-active damper 2 to the designated position in the well.

[0051] Step 2: Start the injection-production work of natural gas 3, the acceleration sensor 219 transmits the measured vibration signal to the digital-to-analog converter 217, the digital-to-analog converter 217 converts the analog quantity of the vibration signal into a digital signal and transmits it to the controller 205, the controller 205 controls the current output intensity of the power supply 203 according to the vibration energy size through the built-in fuzzy control algorithm, the current passes through the coil 208 and generates a magnetic field of different intensity in the magnet core 220, and the magnetic field is radiated to the sealed space below the storage magnetorheological fluid 211, the contraction air bag 212 and the damping particles 213.

[0052] Step 3: The viscosity of the magnetorheological fluid 211 will change rapidly under the action of the external magnetic field, this change is continuous and stepless and reversible, that is, the magnetic field will change back to liquid when removed. The coil 208 and the magnet core 220 generate a magnetic field of different intensity, which makes the viscosity of the magnetorheological fluid 211 change, and then changes the performance parameters of the particle damping vibration, so as to adjust the damping parameters for different vibrations and then achieve the best damping effect.

[0053] Step 4: When the magnetic field strength increases, the viscosity of the magnetorheological fluid 211 increases, the density increases, and the volume decreases. The reduced volume will be supplemented by the expansion of the air bag 212 to avoid the decrease of the pressure in the sealed space, which causes the second outer cylinder 209 to deform due to the pressure difference between the inside and the outside. The vibration of the injection and production string 3 causes the damping particles 213 to move. The damping particles 213 collide and rub with each other. The damping particles 213 and the magnetorheological fluid 211 move and rub with each other to convert the vibration into heat energy to dissipate, thereby achieving the purpose of vibration reduction.

[0054] When the battery 203 runs out of power, it can also serve as a passive damper to achieve good damping effect.

[0055] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A composite variable-damping semi-active damper system for injection-production string of underground gas storage, comprising casing string (1), magneto-rheological fluid and granular damping composite semi-active damper (2), injection-production string (3) and natural gas (4), characterized in that, The magnetorheological fluid and particle damping composite semi-active damper (2) is connected in series on the injection and production string (3) through threads, the annular space formed by the injection and production string (3) and the casing string (1) is filled with the annular filling liquid (5), when the injection and production operation of the natural gas (4) is carried out, the injection and production string (3) generates vibration, the magnetorheological fluid and particle damping composite semi-active damper (2) connected in series on the injection and production string (3) converts the vibration energy of the injection and production string (3) into heat energy and dissipates to achieve the purpose of vibration reduction; The magnetorheological fluid and particle damping composite semi-active damper (2) comprises an upper end cover (201), a first sealing ring (202), a power supply (203), a first outer cylinder (204), a controller (205), a first vibration isolation support (206), an outer cylinder connecting nipple (207), a coil (208), a second outer cylinder (209), an inner cylinder (210), a liquid injection piston (214), a lower end cover (216), a digital-analog converter (217), a second vibration isolation support (218), an acceleration sensor (219) and a magnetic core (220), wherein the outer ring of the upper end cover (201) is connected with the first outer cylinder (204) through threads, the inner ring of the upper end cover (201) is limited by the outer ring of the inner cylinder (210) and is sealed by the first sealing ring (202) to isolate the annular filling liquid (5); the inner ring of the inner cylinder (210) is connected with the injection and production string (3) through threads at both ends; the first vibration isolation support (206) and the second vibration isolation support (218) are connected with the inner cylinder (210) through screws; the controller (205) and the digital-analog converter (217) are connected on the first vibration isolation support (206) and the second vibration isolation support (218) through screws respectively; the acceleration sensor (219) is fixedly connected on the outer wall of the inner cylinder (210) through threads; the upper half of the outer cylinder connecting nipple (207) is connected with the inner ring of the first outer cylinder (204) through threads, the lower half of the outer cylinder connecting nipple (207) is connected with the inner ring of the second outer cylinder (209) through threads, the outer cylinder connecting nipple (207) is positioned with the magnetic core (220) through the stepped structure and limits the displacement of the magnetic core (220); the coil (208) is installed in the outer groove of the magnetic core (220) and is connected with the power supply (203) through the through hole of the outer cylinder connecting nipple (207); the outer ring of the lower end cover (216) is connected with the inner ring of the second outer cylinder (209) through threads; The second outer cylinder (209) and the inner side of the magnet core (220) are provided with grooves and are internally provided with the third sealing ring (221) and the fourth sealing ring (222), the inner ring of the lower end cover (216) is limited by the stepped cooperation with the outer ring of the inner cylinder (210) and is internally provided with the second sealing ring (215), the second sealing ring (215), the third sealing ring (221) and the fourth sealing ring (222) form a sealed space for placing the magnetorheological fluid (211), the deflated air bag (212) and the damping particles (213), when the injection and production string (3) vibrates during the injection and production operation of the natural gas (4), the vibration energy is converted into the kinetic energy of the damping particles (213), and the kinetic energy of the damping particles (213) is converted into heat energy for dissipation through the fluid damping force of the magnetorheological fluid (211), so that the vibration reduction purpose is achieved; the injection piston (214) is threadedly connected on the second outer cylinder (209) and is used for filling the magnetorheological fluid (211).

2. The combined variable-damper semi-active vibration absorber system for injection and production string in underground gas storage according to claim 1, characterized in that, The first vibration isolation support (206) and the second vibration isolation support (218) are internally provided with rubber pads with vibration isolation effects to reduce the influence of vibration on the controller (205) and the digital-analog converter (217).

3. The combined variable-damper semi-active vibration absorber system for injection and production string in underground gas storage according to claim 1, characterized in that, The power supply (203) is limited in the upper half part of the first outer cylinder (204) through the stepped structure of the first outer cylinder (204) and provides energy for the controller (205), the coil (208), the digital-analog converter (217) and the acceleration sensor (219).

4. The combined variable-damper semi-active vibration absorber system for injection and production string of underground gas storage according to any one of claims 1-3, characterized in that, The method for using the semi-active damper system comprises the following steps: Step 1: assemble the injection and production string (3) with the magnetorheological fluid and particle damping composite semi-active damper (2) on land, inject the magnetorheological fluid (211) through the injection piston (214) and lower the injection and production string (3) and the magnetorheological fluid and particle damping composite semi-active damper (2) to the designated position in the well; Step 2: start the injection and production work of the natural gas (4), the acceleration sensor (219) transmits the measured vibration signal to the digital-analog converter (217), the digital-analog converter (217) converts the analog quantity of the vibration signal into a digital signal and transmits it to the controller (205), the controller (205) controls the current output strength of the power supply (203) according to the vibration energy size through the built-in fuzzy control algorithm, the current passes through the coil (208) and generates a magnetic field with different intensities in the magnet core (220), the magnetic field is radiated to the sealed space below the stored magnetorheological fluid (211), the deflated air bag (212) and the damping particles (213); Step 3: the magnetorheological fluid (211) rapidly changes in viscosity under the action of the applied magnetic field, that is, it changes back to a liquid when the magnetic field is removed; The coil (208) and the magnet core (220) generate a magnetic field with different intensities to change the viscosity of the magnetorheological fluid (211) and change the performance parameters of the particle damping vibration reduction, so as to adjust the damping parameters for different vibrations and achieve the best vibration reduction effect. Step 4: When the magnetic field strength increases, the viscosity of the magnetorheological fluid (211) increases, the density increases, and the volume decreases, and the reduced volume will be supplemented by the expansion of the air bag (212) to avoid the decrease of the pressure in the sealed space causing the second outer cylinder (209) to deform due to the pressure difference between the inside and outside; The vibration of the injection and production string (3) causes the damping particles (213) to move, and the damping particles (213) collide and rub with each other, and the friction between the damping particles (213) and the magnetorheological fluid (211) converts the vibration into heat energy dissipation, achieving the purpose of vibration reduction.

5. The combined variable-damper semi-active vibration absorber system for injection and production string in underground gas storage according to claim 4, characterized in that, When the power source (203) runs out of energy, the magnetorheological fluid and particle damping composite semi-active shock absorber (2) becomes a passive shock absorber.

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